I would euthanize puppies before I would EVER sell them to ANYONE for resale.

NEVER under any CIRCUMSTANCE would ANY responsible breeder sell a puppy to be resold in a retail outlet. Period.

Get the store. Place the puppies already there carefully with required spay/neuter. If you want puppies or kittens in the store, take in puppies from the local shelter to place, or allow rescue orgs to come in on the weekend and adopt out.